class Sum {
  int n;
  float f() {
    float sum=0;
    for(int i=1;i<=n;i++)
    sum=sum+i;
    return sum;
  }
}
class Average extends Sum {
  int n;
  float f(){
    float c;
    super.n=n;
    c=super.f();
    return c/n;
  }
  float g() {
    float c;
    c=super.f();
    return c/2;
  }
}
public class Example5_7 {
  public static void main (String args[]){
    Average aver = new Average();
    aver.n=100;
    float resultOne=aver.f();
    float resultTwo=aver.g();
    System.out.println("resultOne="+resultOne);
    System.out.println("resultTwo="+resultTwo);
  }
}
